Effects of cooking on ethylenebisdithiocarbamate degradation to ethylene thiourea

Watts, Randall R; Storherr, R W; Onley, John H

doi:10.1007/bf01684966

Cited by 53 publications

(22 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…3, the concentration of pesticide residues is reduced by microwave cooking only to a limited extent. The highest reduction observed is for mancozeb (39% & 25%), a compound which is unstable in an acidic and aqueous environment (Newsome & Laver, 1973;Watts, Storherr, & Onley, 1974). After microwave cooking, the conversion of mancozeb to ETU could be quantified (Fig.…”

Section: Microwave Cookingmentioning

confidence: 96%

Effect of household and industrial processing on levels of five pesticide residues and two degradation products in spinach

et al. 2012

View full text Add to dashboard Cite

Section: Microwave Cookingmentioning

confidence: 96%

Effect of household and industrial processing on levels of five pesticide residues and two degradation products in spinach

et al. 2012

View full text Add to dashboard Cite

“…When three vegetable crops (Watts et al 1974) or grains (Rosenberg and Siltanen 1979) were cooked in water at 100 C for 15 and 30 min, respectively, conversion factors as high as 30% (w/w) have been observed. The fate of residues in homogenates of pears (Ripley and Simpson 1977) or grapes heated at 100 C were also reported.…”

mentioning

confidence: 96%

Stability of the dithiocarbamate pesticide maneb in tomato homogenates during cold storage and thermal processing

Kontou

Tsipi²,

Tzia

2004

Food Additives and Contaminants

View full text Add to dashboard Cite

The effect of storage at 5 degrees C and of thermal processing by cooking at 100 degrees C and sterilization at 121 degrees C for 15 min on maneb residues in tomato homogenates was investigated. Remaining maneb and its toxic metabolite ethylenethiourea (ETU) were measured after each treatment by headspace gas chromatography with flame-photometric detection and by high-performance liquid chromatography with photo-diode array detection, respectively. No significant loss of maneb was observed during cold storage for up to 6 weeks, taking into account analytical variability. Conversely, thermal treatment resulted in substantial degradation of maneb with extensive conversion to ETU. After cooking, only 26 +/- 1% (+/- SE, n = 8) of initial maneb residues remained in the samples, whilst the conversion to ETU was 28 +/- 1% (mol mol(-1)) (+/- SE, n = 4). Sterilization eliminated the residues of the parent compound giving rise to conversion to ETU up to 32 +/- 1% (mol mol(-1)) (+/- SE, n = 4).

show abstract

“…Both ETU and i-PTU are of particular concern as they had been shown to be teratogenic and carcinogenic, and capable of producing genotoxic effects [9,10]. Cooking and other processing of plant material contaminated with EBDCs has been shown to increase the level of ETU [11,12]. Therefore, monitoring of PYR residues and the ETU/i-PTU level in foods is of particular concern for human health.…”

Section: Introductionmentioning

confidence: 96%

Development and validation of a method for determination of residues of 15 pyrethroids and two metabolites of dithiocarbamates in foods by ultra-performance liquid chromatography–tandem mass spectrometry

Chung¹,

Lam²

2012

Anal Bioanal Chem

View full text Add to dashboard Cite

This paper reports a novel approach for the detection, confirmation, and quantification of 15 selected pyrethroid pesticides, including pyrethins, and two metabolites of dithiocarbamates in foods by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS-MS). The proposed method makes use of a modified QuEChERS (quick, easy, cheap, effective, rugged, and safe) procedure that combines isolation of the pesticides and sample cleanup in a single step. Analysis of pyrethroids and dithiocarbamate metabolites was performed by UPLC-MS-MS operated with electrospray and atmospheric pressure chemical ionization, respectively. Two specific precursor-product ion transitions were acquired per target compound in multiple reaction monitoring (MRM) mode. Such acquisition achieved the minimum number of identification points according to European Commission (EC) document no. SANCO/10684/2009, thus fulfilling the EC point system requirement for identification of contaminants in samples. The method was validated with a variety of food samples. Calibration curves were linear and covered from 1 to 800 μg kg(-1) in the sample for all target compounds. Average recoveries, measured at mass fractions of 10 and 100 μg kg(-1) for pyrethroids and 5 and 50 μg kg(-1) for dithiocarbamate metabolites, were in the range of 70-120% for all target compounds with relative standard deviations below 20%. Method limits of quantification (MLOQ) were 10 μg kg(-1) and 5 μg kg(-1) for pyrethroids and dithiocarbamate metabolites, respectively. The method has been successfully applied to the analysis of 600 food samples in the course of the first Hong Kong total diet study with pyrethroids and metabolites of dithiocarbamates being the pesticides determined.

show abstract

Effects of cooking on ethylenebisdithiocarbamate degradation to ethylene thiourea

Cited by 53 publications

References 2 publications

Effect of household and industrial processing on levels of five pesticide residues and two degradation products in spinach

Effect of household and industrial processing on levels of five pesticide residues and two degradation products in spinach

Stability of the dithiocarbamate pesticide maneb in tomato homogenates during cold storage and thermal processing

Development and validation of a method for determination of residues of 15 pyrethroids and two metabolites of dithiocarbamates in foods by ultra-performance liquid chromatography–tandem mass spectrometry

Contact Info

Product

Resources

About